Holder for sharpening gravers or other tools.



I M. J. COLLINS. HOLDER FOR SHARPENING GRAVERS OR OTHER TOOLS.-

APPLIOATION FILED NOV.1, 1909.

Patented Nov. 8, 1910;

Fig. 3

finurnmr M MICHAEL J. commas, or DETROIT, MIcHieAN; f. I

HOLDER ron sHAnP ENINe eRAvEnson OTHER TOOLS.

a part of this specification.

My invention relates to an improvement in devices for supporting andholding gravers while being reground, shown in the accompanying drawingsand more particularly pointed outin the claims.

The object of the present invention is to provide a simple, effective,and inexpensive device adapted to be adjusted to the requirements of thecutting edges or angles of the different forms of gravers in common use,whereby the tools may be resharpened on a suitable oil stone ;'-theoriginal angle of the cutting edges of the tools being therebypreserved.

Other advantages and improvements will hereafter appear.

In the drawings accompanying this specification: Figure 1 is aperspective view of the device supporting a graver in position forsharpening. Fig. 2 is an elevation of the rotatable disk in which thetool is held, inclosed in the graduated supporting frame. Fig. 3 is acentral cross-sectional view through the device showing the graversecured therein in position for sharpening.

Referring now to the letters of reference placed upon the drawings: A isa suitable oil stone, and A a supporting slab of glass or other smoothmaterial.

B is a rotatable disk supported in an annular frame C having projectingarms C each of which is provided with an aperture through which projectsthe adjustable graduated legs D.

E are thumb screws having a screwthreaded engagement with the arms Cadapted to engage the legs D to secure them when properly adjusted.

0 is an inwardly projecting flange formed in the annular frame C.

b is a complementary recessed portion formed in the rotatable disk Binto which said flange projects.

Specification of Letters Patent. "P t nted N Application filed November1,1909. seriar'no; 525,620.

c are screws set in the annular frame,

.their projecting heads engaging. the rotatable" disk wherebythe diskwhile being free to turn is held against lateral displace- 'ment betweenthe screws 0 and the projecting flange c .of the annular frame. Thescrews may also be provided 1f deslred with washers which would giveadditional bearing. surface on the rotatable disk.

F is a thumb screw set in the annular frame and adapted to engage thedisk to secure it against rotation.

B is a projecting hub portion. formed integral with the disk, throughthe wall of which is set a thumb screw G designed to engage the shank Hof the graver or other tool to be sharpened to secure itwhen properlyadjusted.

The central opening in the disk is preferably provided with a V-shapedgroove 1) in which the graver may set to secure it against displacement.

C are a series of graduations formed on the annular frame C and B agraduation or ointer on the disk B being provided to act in conjunctionwith the graduations C whereby the graver may be set at any desiredangle with respect to the central or neutral point and then re-set at acorre sponding angle for the opposite edge of the tool.

Having indicated the several parts by reference letters, the operationof the device will be readily understood.

The graver is first secured in the rotatable disk which is adjusted topresent one of its cutting edges to the proper angle to the stone, thelegs D being also adjusted to present the graver at a proper anglethereto. The stone being supported on a slab of glass or other polishedsurface, the legs of the device are free to move readily when given areciprocating motion in the direction of the length of the stone. Uponthe completion of the sharpening of one of the surfaces the disk isadjusted in the opposite direction, the graduations indicating theproper angle and the disk again set when the operation just described isrepeated.

Having thus described my invention, what I claim is 1. In a device forsupporting and holding gravers while being ground, an annular supportingframe provided with projectin arms having perforations, legs passedthrough the perforations of the arms and having rounded lower ends,means whereby the legs y be djiistab y he d n the p forations of saidarms," the annular frame being provided witha seriesof graduations andatone edge an inwardly projectingfiange, an annular disk "adapted to ibe set in said frame and having one edge and having portions adapted toenga e the wall of the disk to secure it against ateral displacement inthe opposite direction with relation to the frame, said disk having aprojecting hollow hub provided with an internal angular depression inits inner annular Wall extending throughout the length of the hub andthe width of the disk, said angular depression being adapted to receivethe shank of a projecting tool adapted to be set therein, an adjustablethumb screw passed through the Wall of said hub and adapted to bear uponsaid tool to secure the latter against displacement, and means securedto the annular frame and adapted to v bear against said diskintermediatethe edges of the latter to secure the disk against rotation.

'2. In a device for supporting and holding ravers While being ground,- asupporting rame, legs mounte injthe frame, means for adjusting thealtitude of the frame With respect to sand legs, a disk supportedin-said annular frame and free 'to rotate therein, the disk having arecess and the frame being provided With .a tongue fitting the recess toprevent lateral displacement of the disk in one direction, Said framehaving sockets adjacent the periphery of the disk, and means operable insaid sockets and having portions overlapping the disk at its peripheryto prevent lateral displacement of the disk in the opposite directionwith relation to the frame, said disk having a hub adapted to receiveand support a projecting tool, means for securing the tool in said hub,and means whereby the disk may be secured against rotation in the frame.

In testimony whereof, I sign this specificat-ion in the presence of twoWitnesses.

MICHAEL J. COLLINS. Witnesses:

GRACE E. WYNKOOP, SAMUEL E. THOMAS.

